Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Smelting method for improving surface quality of steel plate

A technology of surface quality and smelting method, applied in the field of iron and steel smelting, can solve the problems of little effect, poor effect, neglecting the effect of materials, etc., to reduce the damage of surface quality, facilitate high-temperature desulfurization, and reduce the probability of grinding treatment.

Inactive Publication Date: 2019-07-16
NANJING IRON & STEEL CO LTD
View PDF4 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Technologists who research on the surface quality of steel plates often focus on the rolling process and inspection process, but with little effect and poor results, ignoring the influence of the smelting process on the surface quality of rolled products, and ignoring the role of the raw materials of the material itself

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Smelting method for improving surface quality of steel plate
  • Smelting method for improving surface quality of steel plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A smelting method for improving the surface quality of steel plates provided in this embodiment,

[0034] S1. Its chemical composition and mass percentage are as follows: C: 0.02%~0.20%, Si≤0.20%, Mn: 1.20%~2.20%, P≤0.030%, S≤0.0050%, Ni≤0.30%, Nb≤0.070% , Cu≤0.50%, N≤0.0050%, Ti: 0.006%~0.020%, Cr≤0.30%, Al: 0.015%~0.050%, the balance is Fe and impurities;

[0035] S2. The desulfurization station uses lime and magnesium powder for composite desulfurization. After desulfurization, the slag is cleaned. S in the molten iron is ≤ 0.0020%, and after the converter, S: 0.0008%;

[0036] S3. Steelmaking adopts the process route of BOF→LF furnace refining→RH refining→continuous casting; converter tapping temperature is 1696°C; converter tapping adopts pre-melted refining slag + active lime for slagging;

[0037] S4. After the molten steel reaches the LF furnace, heat up the slag, and the composition meets the requirements of step S1;

[0038] S5, RH meets vacuum degree ≤ 3mba...

Embodiment 2

[0041] A smelting method for improving the surface quality of steel plates provided in this embodiment,

[0042]S1, its chemical composition and mass percentage are as follows: C: 0.20%~0.60%, Si≤0.20%, Mn: 0.30%~1.60%, P≤0.030%, S≤0.0050%, Ni≤0.30%, Nb≤0.070% , Cu≤0.50%, N≤0.0050%, Ti: 0.006%~0.020%, Cr≤0.30%, Al: 0.015%~0.050%, the balance is Fe and impurities;

[0043] S2. The desulfurization station uses lime and magnesium powder for composite desulfurization. After desulfurization, the slag is cleaned. The S in the molten iron is ≤ 0.0020%, and the S in the converter is 0.0006%;

[0044] S3. Steelmaking adopts the process route of BOF→LF furnace refining→RH refining→continuous casting; converter tapping temperature is 1706°C; converter tapping adopts pre-melted refining slag + active lime for slagging;

[0045] S4. After the molten steel reaches the LF furnace, heat up the slag, and the composition meets the requirements of step S1;

[0046] S5, RH meets vacuum degree ≤...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a smelting method for improving surface quality of a steel plate, and the chemical composition comprises by mass percent: 0.02%-0.60% of C, less than or qual to 0.20% of Si, 0.30%-2.20% of Mn, less than or equal to 0.030% of P, less than or equal to 0.0050% of S, less than or equal to 0.30 % of N, less than or equal to 0.070% of Nb, less than or equal to 0.50% of Cu, less than or equal to 0.0050% of N, 0.006%-0.020% of Ti, less than or equal to 0.30% of Cr, 0.015%-0.050% of Al and balance of Fe and impurities. The smelting method provided by the invention can achieve the purpose of optimizing the surface quality of a casting blank by rationally adjusting the smelting composition, high-purity steel smelting, low-oxygen nitrogen harmful element control, reasonable superheat control, covering slag selection, dynamic soft reduction adjustment and the like.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, in particular to a smelting method for improving the surface quality of steel plates. Background technique [0002] With the increasingly fierce competition in the domestic market, customers are increasingly demanding on the quality of steel plates. Industries such as construction machinery and shipbuilding have very strict requirements on the surface quality of steel plates. Among them, steel plates for Carter and steel plates for luxury cruise ships have extremely high requirements on the surface. The surface roughness visible to the naked eye caused by the exfoliation of the pressed iron oxide scale is not allowed to cause water ripples during the manufacturing process, and the entire steel plate is not allowed to have pits and pits. Technologists working on the surface quality of steel plates often focus on the rolling process and inspection process, but with little success an...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C22C33/04C22C38/02C22C38/04C22C38/06C22C38/42C22C38/48C22C38/50C22C38/58B22D11/111B22D11/18C21C5/36C21C7/064C21C7/10
CPCB22D11/111B22D11/18C21C5/36C21C7/0645C21C7/10C22C33/04C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/42C22C38/48C22C38/50C22C38/58
Inventor 翟冬雨吴俊平方磊姜金星洪君靳星刘呈军杜海军员强鹏殷杰冯巍雷晓荣
Owner NANJING IRON & STEEL CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com